TRT400 is the newest and most advanced DV Power transformer turns ratio tester. The main application is a measurement of transformer turns ratio but it also measures transformer excitation current and phase shift. TRT400 turns ratio tester can also perform automatic vector group detection and magnetic balance on three-phase transformers and three-phase autotransformers. It has a built-in true three-phase power source. For that reason, it can test transformers with special configurations, such as phase-shifting, rectifier, arc-furnace, traction transformers, etc.
The instrument can output test voltages from 1 V AC to 430 V AC. With the highest test voltage 430 V AC, TRT400 provides the most accurate turns ratio testing of power transformers used in power generation and transmission. With the low test voltage of 1 V AC, it enables turns ratio verification of current transformers.
TRT400 has a large 7” graphical touch screen display. Besides making the interface much more user-friendly compared to older turns ratio testers, it also brings certain options that were previously available only with DV-Win software. The most important are test templates and automatic test mode. Users can simply create test templates, store them in the instrument’s memory, and load when in the field with just a few clicks.
This turns ratio test set, as well as all other DV Power turns ratio testers, has a built-in tap changer control unit. It enables remote control of on-load tap changer (OLTC) directly from the instrument. In order to make the most out of this feature, the instrument can be programmed to do everything automatically – running turns ratio tests, changing OLTC tap positions, and saving results. This option, especially in combination with test templates, significantly facilitates and shortens the turns ratio testing time.